To reproduce:

1. Download attached "TextMeshProInputFieldCrash.zip" project and open in Unity
2. Open "SampleScene" scene
3. Build for iOS
4. Deploy the Xcode project to the iOS device
5. Click on the InputField
6. Type something
7. Hold down Backspace on the on-screen Keyboard until the Text is completely deleted and hold it for a bit more

Expected results: No Crashes and no Exceptions are being thrown when deleting the Text from the InputField
Actual results: The Game does not crash, but Exceptions are being thrown in the Log:

"ArgumentOutOfRangeException: Selection is out of range.
Parameter name: selection
at UnityEngine.TouchScreenKeyboard.set_selection (UnityEngine.RangeInt value) [0x0003a] in <f87863d3d6d8426eb49e406f337e22e4>:0
at TMPro.TMP_InputField.GenerateCaret (UnityEngine.UI.VertexHelper vbo, UnityEngine.Vector2 roundingOffset) [0x00109] in <9018cd3bccf849d69e032463692a8446>:0
at TMPro.TMP_InputField.OnFillVBO (UnityEngine.Mesh vbo) [0x0009f] in <9018cd3bccf849d69e032463692a8446>:0
at TMPro.TMP_InputField.UpdateGeometry () [0x0001f] in <9018cd3bccf849d69e032463692a8446>:0
at TMPro.TMP_InputField.Rebuild (UnityEngine.UI.CanvasUpdate update) [0x00004] in <9018cd3bccf849d69e032463692a8446>:0
at UnityEngine.UI.CanvasUpdateRegistry.PerformUpdate () [0x00121] in <47839348810e43629ed4e6a410217b7e>:0"

Notes:
- This issue happens on both iOS and Android
- This issue does do not reproduces if the "Hide Mobile Input" flag on the InputField is disabled

Tested with:
- iPhone 8 Plus, iOS: 12.0 - Reproduced
- iPhone XR, iOS: 12.0 - Reproduced

Reproduced on Package version 1.4.0 - preview.1b and 2.0.1
Not reproduced on Package version 1.3.0
Regression on Package version 1.4.0 - preview.1b

Reproduced on Unity 2018.4.3f1, 2019.1.7f1, 2019.2.0b6 and 2019.3.0a7